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<H1>IBM Visualization Data Explorer Programmer&#39;s Reference</H1>
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<H2><A NAME="HDRASYNS" HREF="progu055.htm#PToC_143">13.11 Asynchronous
Services</A></H2>
<A NAME="IDX1051"></A>
<P>
The asynchronous services routines enable a module with an external
interface (e.g., to another application through a socket) to
signal the executive that it is ready to run again.
<P>
If the module has signaled its readiness to run again, and Data Explorer is
in <TT><STRONG>Execute on Change</STRONG></TT> mode, the system reexecutes the
module immediately (and any modules downstream
as well).
Otherwise, it does not run until the next time the user
initiates an execution.
<P>
<TABLE CELLPADDING="3">
<TR VALIGN="TOP"><TD><P><B><TT><STRONG>Error DXReadyToRun()</STRONG></TT>
</B></TD><TD><P>Enables an asynchronous module to signal that it is ready to
execute again.
<A NAME="IDX1052"></A>
<A NAME="IDX1053"></A>
See  <A HREF="progu286.htm#HDRDXRTR">DXReadyToRun</A>.
</TD></TR><TR VALIGN="TOP"><TD><P><B><TT><STRONG>Error
DXRegisterInputHandler()</STRONG></TT>
</B></TD><TD><P>Assigns a handler routine for input coming from an open file
descriptor.
<A NAME="IDX1054"></A>
<A NAME="IDX1055"></A>
See  <A HREF="progu289.htm#HDRDXREGIH">DXRegisterInputHandler</A>.
</TD></TR><TR VALIGN="TOP"><TD><P><B><TT><STRONG>Error DXFreeModuleId()
<BR>
Pointer DXGetModuleId()
</STRONG></TT>
</B></TD><TD><P>Get a unique identifier for each instance of a module.
<A NAME="IDX1056"></A>
<A NAME="IDX1057"></A>
<A NAME="IDX1058"></A>
<A NAME="IDX1059"></A>
See  <A HREF="progu151.htm#HDRDXFMID">DXFreeModuleId</A> and  <A
HREF="progu185.htm#HDRDXGMID">DXGetModuleId</A>.
</TD></TR><TR VALIGN="TOP"><TD><P><B><TT><STRONG>Error
DXCompareModuleId()</STRONG></TT>
</B></TD><TD><P>Returns OK if the two specified module identifiers are the same;
otherwise returns ERROR.
<A NAME="IDX1060"></A>
<A NAME="IDX1061"></A>
See  <A HREF="progu118.htm#HDRDXCMPMI">DXCompareModuleId</A>.
</TD></TR><TR VALIGN="TOP"><TD><P><B><TT><STRONG>Pointer
DXCopyModuleId()</STRONG></TT>
</B></TD><TD><P>Returns a pointer to a copy of the specified module identifier.
<A NAME="IDX1062"></A>
<A NAME="IDX1063"></A>
See  <A HREF="progu123.htm#HDRDXCPMI">DXCopyModuleId</A>.
</TD></TR></TABLE>
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